Printer&#39;s plate-hook.



M. HOGE- a; J. W. PITT. PRINTERS PLATE HOOK. APPLICATION FILED ROVJ),1911. fiENEWEU JULY 12, 1912. 1,043,105.

Patented 1w; 5, 1912.

Y W m aat Mine/Jaw UNITED STATES PATENT oFFIonj MAX JOHN PITT, OFCHICAGO, ILLINOIS, ASSIGNORS TO UPRIGHT GRAIN PRINTING BASE COMPANY, OFCHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

tenmrnns PLATE-HOOK.

Specification of Letters Patent.

Application filed Novcmlidrh, 1911, Serial No. 659,270. Renewed July 12,1912. Serial No. 709,066.

To all whom it may concern:

Be it known that we, MAX Hose and JOHN WV. PITT, citizens of theUnitcdStates, re-

siding at Chicago, in the county of Cook and State of Illinois, haveinvented new an useful lmpro rements in Printers Plate- Hooks, of whichthe following is a specification, reference being had to theaccompanying drawings, forming a part thereof.

The purpose of this invention is to-provide an improved device of thecharacter of a plate-hook- :tor locking printing plates in a form.

It consists of the features of construction shown and described in thedrawings as indicated in the claims.

In the drawings :Figure 1 is a Vertical section through a portion or aform with a plate-hook therein embodying this invention. Fig. 2 is aplan view showing a portion of a form with two similar plate-hookspositioned for holding a printing plate in the form. Fig. 3 is an endelevation of the plate-hook shown in Fig. 1. Fig. 4 is a section takenas indicated at line l4= on Fig. 1, and also showing a keyor wrench inposition for adjusting the clamping device. Fig. 5 is a detail of thejaw member, being a bottomplan view thereof. v

In the drawings, A, represents one slde' of the chase; B, block in theframe; C, the printing plate thereon.

j The plate-hook comprises a I block or frame, D, of the height of theplate base, B, having a longitudinal channel or way, 1), extending fromend to end and opening up through the to p of the block but not throughthe bottom, the opposite sides of said chan nel or way beipg providedtoward the upper side with horizontal grooves, D D The hook or jaw, E,whose overhanging lip, c, is to engage the plate, C, is slidably mountedin the grooves, D D, and is thus adapted for adjustment toward and fromthe plate, C. Such adjustment is accomplished by means of the controllerscrew, F, set in the jaw, E, with its axis perpendicular to the plane ofthe bottom wall of the channel, D, this bottom wall being inclined tothe direction of the grooves, D D and to the direction of adj ustment ofthe jaw, E. The threaded aperture in the aw, E, which contains .theadjusting" controller. screw, F, is continued upwardly. in an aperture,E through which the squared end of an operating key, G, may be insertedfor engaging the squared recess, F of the screw, and rotating the latterfor adjustment of the jaw, E.

The above described construction'is de-' signed as an improvement uponthat shown in the issued Patent, No. 989,153, in which the controllerscrew, F, was provided with a flange at its lower end, engaged ininclined guide-slots; this necessitated the rotation of the screw foraccomplishing any movement of the jaw, E, in either direction along thebloclc, D. But, in the present construction, the jaw may be much morereadily released from the plate, C, by rapidlyunscrewing the screw, F,and sliding the jaw, E, out of engagement with the plate; and similarly,this arrangement allows or quicker adjustment-of the jaw for securingthe plate, C, such adjustment being made by merely slid ing the jaw tothe position in which its overhanging lip, e, engages the plate, C, whena slight turn of the controller screw, F, will serve to clamp the partsin position.

. As a further improvement upon the form of the device shown in theabove-mentioned Patent, No. 989,153, the portion of the jaw member,-E',"which is carried in the channel,

D is made circular in cross section so as to lie-rotatable therein. Thiscircular partcomprises the bottom flange, E which is carried in theguide grooves, D D and the top of the jaw member just above this flange,

' indicated at E and positioned between the lips, D, D, of the block, D;This con Patented Nov. 5, 1912.

struction permits the clamping lip, e, to

accommodate itself to any irregularity in the outline of the prlnt-ingplate, C, when such outlines do not lie exactly perpendicular to thedirection of the channel, D this avoids the undue strain upon the lip,e, which would result if such accommodation were not possible.

It will be notedtha-t the drawings show I the bottom wall, D, of thechannel, D as curved or rounded transversely. The puiy pose of thisrounding of the bottom of the channel is to neutralize to some extentthe efiect which any slight rotation of the jaw member, E, within thechannel, will'have upon the angle at which the screw, F, meets thebottom of the channel. It will be understood that ifthe channelwere madewith a flat bottom, then-the screw, F, would stand perpendicular to thisbottom only when the screw would be directed guide ways,

horizontal or at least groove, D D ,Such

I wall of the channel at an acute angle. If the bottom of the channel, Dcould be so curved that when the jaw member, E, were rotated about itsaxis within the channel, the screw, F, would still stand erpendicul'arto the bottom wall, D, and the entire force of the to clamping theprinting plate and would not tend to create any undesired strains in theblock, D; Although this condition cannot be perfectly lfulfilled, t-hewall, D, might be formed as the surface of a cone whose axis should bethe path of the point of intersection of'two axes, namely, those of thescrew, F, and of the cylindrical jawmember, E, respectively,the axis ofsuch cone would thus be parallel to the guide a surface would preventany side thrust fromthe screw, F, upon the guide groove, D D when thejaw member, E, were rotated away from its normal straight-aheadposition, and would insure that the entire force of the screw wasdirected against the printing plate to be clamped. Whil'eit might notprove worth while to manufacture the block with the surface, D,conforming exactly to this theoretical surface, it-is found preferableto give it a curve approximating such a surface, and such a curve isshown in the drawings.

1. A printers plate hook, comprising a block provided with longitudinalguide ways,- and having an interior wall whose plane is oblique to thedirection of such guide ways, a jaw member slidably mounted in the guideways, and a clamping device on the jaw member adapted for movementtoward and away from the oblique wall of the block and for exertingpressure thereagainst.

2. A printers plate hook, comprising a block provided with longitudinalguide ways, and having an interior wall whose plane is oblique to thedirection of such a jaw member slidably mounted in the guide ways andhavin a threaded bore whose axis is erpendicu ar to the oblique wall ofthe b ock, and a clamp-screw engaged in said bore adapted for adjustmenttoward and away from said oblique wall.

3. A printers plate hook, comprising a aving a longitudinal channelprovided with longitudinally horizontal guide ways in its sides and alongitudinally sloping.bottom; a jaw member mounted slidably positioneddirectly ing an oblique bore in the horizontal guide Ways and rotatableber having a bore extendin through it from top to bottom and three ed,and a screw engaged in said bore, accessible through, the upperend orthe bore for adjustment toward and from the slopingbottom wall of thechannel.

4. A printers plate hook, comprising a block havin a longitudinalchannel provided with ongitudmally horizontal guide ways 1n its. sidesand a slo ing bottom a jaw member mounted in the ways, slidably and forrotation of the jaw about a vertical axis, said jaw member having anoblique bore extending through it from top to bottom whose axis isinclined in the direction in which the and accessible through the topof. the bore for adjusting it toward and from the sloping bottom.

A printers plate hook, comprising ablock having a longitudinal channelvidedways in its sides and a jaw member mounted in the horizontal ways",slidabl-y and for about a vertical axis,

pro-

1de rotation ofthe jaw said jaw member havextending 'throu h it from,top to'- bottom whose axis is inc ined in the direction in which thejaw feces, and a screw engaged with the threaded bore and accessiblethrough the top of the bore for adjusting it ,toward and from thesloping bottom, the bottom end of the screw being spherically curved forbearing at different angles upon the slo ing bottom.

6. A printers p ate hook comprising, a block having a longitudinalchannel provided with longitudinally horizontal guide ways in its sides,and a longitudinall slo ing bottom; a jaw member'mounted s idabi y inthe-horizontal guide ways and rotatable therein about a vertical axis,said jaw'member having a bore extndin through it from top to bottom andthreade and a screw enorizontal gu1de.

jaw faces, and a screw engaged with the threaded bore withlongitudinally horizontal guide sloping bottom, a.

gaged in said bore accessible to the upper 4 end of the bore foradjustment toward and from the sloping bottom wall of the channel,

the said bottom wall of the channel being transversely concave and theend of the screw which operates thereagai nst being spherically rounded.

In testimony whereof we have hereunto set our hands at Chicago,Illinois, this 28th day of October 1911.

MAX HOGE. JOHN w, PITT.

